C++20新增的数字比较函数

浏览C++refreence时注意到，C++20开始，增加了一批数字比较的函数

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template <class T, class U>
constexpr bool cmp_equal (T t , U u) noexcept
template <class T, class U>
constexpr bool cmp_not_equal (T t , U u) noexcept
template <class T, class U>
constexpr bool cmp_less (T t , U u) noexcept
template <class T, class U>
constexpr bool cmp_greater (T t , U u) noexcept
template <class T, class U>
constexpr bool cmp_less_equal (T t , U u) noexcept
template <class T, class U>
constexpr bool cmp_greater_equal (T t , U u) noexcept
template <class R, class T>
constexpr bool in_range (T t) noexcept